Remove Go SDK submodule

Signed-off-by: Marc Duiker <marcduiker@users.noreply.github.com>

Author: marcduiker

.gitmodules

@@ -8,9 +8,6 @@
 	path = translations/docs-zh
 	url = https://github.com/dapr/docs-zh.git
 	branch = v1.0_content
-[submodule "sdkdocs/go"]
-	path = sdkdocs/go
-	url = https://github.com/dapr/go-sdk.git
 [submodule "sdkdocs/java"]
 	path = sdkdocs/java
 	url = https://github.com/dapr/java-sdk.git